Steamboat, If I read your post correctly I'm not surprised you're having trouble. In no crop that I know of would you set the top sieve (chaffer) tighter than the bottom sieve (shoe). Set the top sieve at 5_8, the botom sieve at 3_8, the concave clearence on about 2, and the rotor speed 650, the air at 1050 to 1070 and you should have a perfect sample. K.A.